我只是在学习使用postgres Db的流复制，试图达到这里所描述的目标：https://cloud.google.com/community/tutorials/setting-up-postgres-hot-standby
我已经完成了主服务器和备用服务器的所有配置。但在我的情况下，我使用的是Postgres版本10.3。
因此，在运行带有选项--wal-method=stream的pg_basebackup命令时，我得到了以下错误：-
[vagrant@postgres1 bin]$ ./pg_basebackup -h /tmp/ -p 5432 -D /home/vagrant/postgres/data2 -P -v --wal-method=stream
pg_basebackup: initiating base backup, waiting for checkpoint to complete
pg_basebackup: checkpoint completed
pg_basebackup: write-ahead log start point: 0/2D000028 on timeline 1
pg_basebackup: starting background WAL receiver
33824/33824 kB (100%), 1/1 tablespace
pg_basebackup: write-ahead log end point: 0/2D0000F8
pg_basebackup: waiting for background process to finish streaming ...
pg_basebackup: could not send copy-end packet: no COPY in progress
pg_basebackup: child process exited with error 1
pg_basebackup: removing data directory "/home/vagrant/postgres/data2"
但是在使用--wal-method=fetch选项执行pg_basebackup时，它成功地完成了
[vagrant@postgres1 bin]$ ./pg_basebackup -h /tmp/ -p 5432 -D /home/vagrant/postgres/data2 -P -v --wal-method=fetch
pg_basebackup: initiating base backup, waiting for checkpoint to complete
pg_basebackup: checkpoint completed
pg_basebackup: write-ahead log start point: 0/2F000028 on timeline 1
50209/50209 kB (100%), 1/1 tablespace
pg_basebackup: write-ahead log end point: 0/2F0000F8
pg_basebackup: base backup completed
但我想要的是从主服务器到辅助服务器的实时复制，这可以通过--wal-method=stream选项实现。
如果有人对此有任何意见，请告诉我。
提前感谢：(
"stream"是wal-method的默认值。跳过这部分。
在不使用--wal-method=stream的情况下运行以下命令
./pg_basebackup -h /tmp/ -p 5432 -D /home/vagrant/postgres/data2 -P -v